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Every Tuesday, Wednesday, Thursday, and Saturday, there are community livestreams of them hosting a series of custom matches (or the metal league, at saturday). there's also a peak hour when everyome comes over and plays hmm; try to find these times. you can find the hours using the steam flowchart, or just hanging around at 17:00 UTC or so, any day of the week.

https://steamcommunity.com/sharedfiles/filedetails/?id=1387107044
Here is an updated guide for all HMM players